The Cypher System is great for everything, but especially underdog scenarios like yours. It also helps the GM be a participant in the game rather than an adversary or a god. It’s such a rich, rewarding system.

Maybe use some GURPs, or FFG's system might actually work really well here.

Probably start by forking from WFRP 2nd edition. You'd have to strip out the Warhammer setting specifics, but it works well for a game of underdog antihero adventurers in a late mediaeval/early modern setting.

I'd maybe go the other way and embrace the comedy. Use Powered by the Apocalypse in the same way Pasion de las Pasiones does. Replace the soap opera elements with whips made out of spaghetti or something.

@juergen_hubert Fire Ruby's Warlock! which is a WHFRP retroclone. The style matches Brancalonia much better.

Cortex Prime. Extremely hackable, nearly impossible to break. Powerful to reinforce flavor with mechanics (which is what I think you're going after). Simple mechanics (if you don't go ham with the Mods).

Check out legend in the mist, new system that just dropped recently. Seems like this would mesh well with the rustic fantasy motif it has going on and its also easily adaptable

Rolling for shoes can be applied to any setting

I hear good stuff about Blades in the Dark, but I'm not too familiar with it. I wonder if that would work.

I'd recommend Pathfinder 2e's combat then, though I haven't played Brancalonia to know if it's a perfect fit.